RUI: Microscopic Structure and Magnetism in Rare Earth Amorphous Alloys

RUI：稀土非晶合金的微观结构和磁性

• 批准号: 8807394
• 负责人: Linda Fritz
• 金额: $ 11.02万
• 依托单位: Franklin and Marshall College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-07-15 至 1992-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8807394&HistoricalAwards=false
• 关键词: RUI; Microscopic; Structure; Magnetism; Rare

The PI proposes to study the local structure and magnetic properties of rare earth amorphous alloys over a range of temperature from approximately .05K to room temperature or above, principally using the Mossbauer effect. The original experiments will be extended to other non-magnetic metal constituents such as aluminum and gallium, and then to the more complicated amorphous systems with the magnetic transition metals, which are of technological interest. As a microscopic probe yielding angular information about the arrangements of ions and magnetic information about individual rare earth ions, the Mossbauer effect is well suited for such studies. Experiments over the range of temperature proposed here will yield information about crystalline electric field parameters, exchange fields, and distributions of these, to be compared to various models of amorphous structure such as dense-random-packing-of- hard-spheres or random network models. These results are anticipated to make a significant contribution to the developing field of amorphous structure and magnetism. The proposed research is also expected to have a major impact on the educational environment of the Physics Department at Franklin and Marshall College by continuing the increased amount of active experimental research on campus, and by continuing the collaboration with Stanford University and contacts with the University of Pennsylvania and Temple University.

该项目提出了在大约的温度范围内研究稀土非晶合金的局部结构和磁性能。5℃至室温或以上，主要利用穆斯堡尔效应。最初的实验将扩展到其他非磁性金属成分，如铝和镓，然后到更复杂的非晶系统与磁性过渡金属，这是技术上的兴趣。作为一种微观探针，穆斯堡尔效应可以得到离子排列的角度信息和单个稀土离子的磁性信息，因此非常适合此类研究。在这里提出的温度范围内的实验将产生有关晶体电场参数、交换场和这些参数的分布的信息，以便与各种非晶结构模型（如硬球密集随机包装或随机网络模型）进行比较。这些结果有望对非晶结构和磁性领域的发展做出重大贡献。拟议的研究也有望对富兰克林和马歇尔学院物理系的教育环境产生重大影响，继续增加校园内的活跃实验研究数量，继续与斯坦福大学合作，并与宾夕法尼亚大学和天普大学保持联系。